With both of them I've had the boyfriends in front of me and said "Well I hope you are using protection?" and the boyfriends have nearly died with embarrassment.
Also if they're sitting down watching TV and a young single mother comes on I'll point at the TV and say "Take note, use a condom".
haha awesome, respect
i almost died of embarrassment when the nurse gave me and my girlfriend a pack full of information and condoms. She said to us make sure you use these..(this was infront of the missus' parents) i was like, totally uncalled for.